Personally I would pick up the phone and call Pacnor and talk to them. Everything I have read on the boards says they are good people to deal with.
I got my last barrel from Spook on this board. Not sure if he is still doing them or not but turn around time was weeks not months and the workmanship was top notch. Just put a post out there for him to contact you. My experience with him was very positive and barrel was outstanding.
Like I said there are many many choices when it comes to the whisper so have fun and enjoy.....
DonT